Thread: Prime lens calculation

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  1. #1 Prime lens calculation 
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    If you had the budget for a 24-70 II lens, but decided to get a few primes, which would they be (low light) within that budget?


    To get 50mm on a RED EPIC, do i need a 35mm?

    Thanks :)

    ps: for filming, not photography
    Last edited by jorge krausch; 03-29-2013 at 06:30 AM.
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  2. #2  
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    i know beginners are annoying but come oooonnn
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    Senior Member Phil Arntz's Avatar
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    What resolution on the EPIC? Different resolution have different crops, so your "focal length" (I think correct term would be field of view) will be different in 1K,2K,3K,4K,5K..

    A 50mm lens is a 50mm lens no matter what. The question is what you are comparing it to. A 50mm lens will have a different field of view on a 5D, 7D, EPIC in different resolutions etc.

    If I had the budget for a 24-70mm II and get primes instead? Rokinon Cine primes.

    I'd get a 24 1.4, 35 1.4,85 1.4. They are currently working on a 50mm too. If you want something on the wider end, 14mm F2.8. They build it too!

    Hope that helps!
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  5. #5  
    Senior Member Yannick Verry's Avatar
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    You can find a lot of information about that subject on the forum.
    But I would say for about 2000 pounds you could go the Rokinon way, and buy the 24/1.4, the 35/1.4 and the 85/1.4. Plus a Zeiss 50/1.4.
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  6. #6  
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    Thanks so much :) Yes I meant field of view on full sensor use. 5K.

    I guess to rephrase i would say:

    If I had a Red Epic and a Canon 5D side by side:

    The 5D has a 85mm lens on. Which lens will give the Red Epic the same field of view and DOF, bokah etc.. as my 5D ?
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  7. #7  
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    OK that second link answers it..
    http://www.artbyphil.com/temp/redEpi...taSheet_2k.png

    (if i understand FF35 is like a Canon 5D sensor?) So a 64mm lens (if it existed) would give me 85mm FOV on the Red Epic.. ?
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  8. #8  
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    LOVE this chart.. thanks Oliver.. So if i were to shoot 2K on the RED epic and wanted 85mm view, Id use a 25mm according to the chart..

    Again, assuming FF35 is the full size sensor designed for Canon L photo lenses.
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  9. #9  
    Senior Member Andy White's Avatar
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    I posted this link on your other thread http://www.abelcine.com/fov/ - it will help you visualize things.
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  10. #10  
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    Thanks Andy.. this is all so much info.. great!!
    Weird, Link A says its a 1.4 crop factor, and Link B says its 1.3 crop.. perhaps because its 16:9 at abelcine?

    A: http://www.abelcine.com/fov/
    B: http://www.artbyphil.com/temp/redEpi...taSheet_5k.png
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